Css for product options

This adds 3 css classes (and renames pricing-options to just options) in order that the B-test shown below will work:

![screen shot 2014-12-11 at 14 35 19](https://cloud.githubusercontent.com/assets/2903904/5395632/f5d7923c-8142-11e4-83f1-0433a71a7d6e.png)